Effects of wood ash and liquid fertilization on the nutritional status and growth of Norway spruce (Picea abies (L.) Karst.)
Hallenbarter, D., Landolt, W., Zimmermann, S., Bucher, J. B., & Schütz, J. P. (2002). Effects of wood ash and liquid fertilization on the nutritional status and growth of Norway spruce (Picea abies (L.) Karst.). Forstwissenschaftliches Centralblatt, 121(5), 240-249. https://doi.org/10.1046/j.1439-0337.2002.02033.x